Quick Realization of Function for Detecting Human Activity Events by Ultrasonic 3D Tag and Stereo Visio. - Yoshifumi Nishida; Toshio Hori; Takeo Kanade; Koji Kitamura; Akifumi Nishitani; Hiroshi Mizoguchi (PerCom, 2004)

Portable ultrasonic 3D tag system based on a quick calibration method. - Akifumi Nishitani; Yoshifumi Nishida; Toshio Hori; Hiroshi Mizoguchi (SMC (2), 2004)